Hello,
Please note that WooCommerce default pages, like the Cart and Checkout, are not fully editable with Elementor by default. Even if you change the Page Builder setting to Elementor, these pages are dynamically generated by WooCommerce templates.
You cannot edit these functional default WooCommerce pages with Elementor directly. Try to use the Theme’s Layout Builder, you can create Custom Layouts for WooCommerce pages like Shop, Category, Single Product page, Cart, and Checkouts. You can use that to create your own custom layouts for these pages.
Further, you can read more about the Layout Builder here: https://xtemos.com/docs-topic/woodmart-woocommerce-layout-builder/
Best Regards,